使用IF語句時AWK語法錯誤

Question

雖然我以前使用過命令提示符/終端，但我對AWK很新。

我有以下腳本，我正在創建基於國家代碼和州代碼的數據子集。但是我得到一個語法錯誤。

BEGIN{ 
    FS = "\t" 
    OFS = "\t" 
    } 

# Subset data from the states you need for all years 
if ($5 == "IN-GA" || $5 == "IN-DD" || $5 == "IN-DN" || $5 == "IN-KA" || $5 == "IN-KL" || $5 == "IN-MH" || $5 == "IN-TN" || $5 == "IN-GJ"){ 
     if (substr($17, 1, 4) == "2000"){ 
      print $5, $12, $13, $14, $15, $16, $17, $22, $23, $24, $25, $26, $28 > "Y2000_India_sampling_output.txt" 
     } 
    } 

在Cygwin，我指的是劇本，我運行的代碼下面的行，你立即看到語法錯誤：

$ gawk -f sampling_India.awk sampling_relFeb-2017.txt 
gawk: sampling_India.awk:20: gawk if ($5 == "IN-GA" || $5 == "IN-DD" || $5 == "IN-DN" || $5 == "IN-KA" || $5 == "IN-KL" || $5 == "IN-MH" || $5 == "IN-TN" || $5 == "IN-GJ"){ 
gawk: sampling_India.awk:20:  ^syntax error 

有什麼想法？

Answer 1

您的if條件未包含在{...}區塊中。

有這樣的：

BEGIN { 
    FS = OFS = "\t" 
} 
# Subset data from the states you need for all years 
$5 ~ /^IN-(GA|DD|DN|KA|KL|MH|TN|GJ)$/ && substr($17, 1, 4) == "2000" { 
    print $5, $12, $13, $14, $15, $16, $17, $22, $23, $24, $25, $26, $28 > "Y2000_India_sampling_output.txt" 
} 

說明如何使用正則表達式，你可以多==條件合併成一個條件。